NullPointerException when processing *[*] xpath expression

Question

I'm trying to pull only elements that have an element as a
child, using the *[*] xpath expression. When I use MSXML 3.0,
my results are correct. When I use ORAXSL (NT 9i version
downloaded from OTN), I get a NullPointerException. Please see
example below.
<?xml version="1.0"?>
<TABLES>
     <TABLE1>
          <TABLE1_ROW1>TEXT1</TABLE1_ROW1>
          <TABLE1_ROW2>TEXT2</TABLE1_ROW2>
     </TABLE1>
     <TABLE2>
          <TABLE2_ROW1>TEXT3</TABLE2_ROW1>
     </TABLE2>
     <TABLE3>
          <TABLE3_ROW1>TEXT4</TABLE3_ROW1>
     </TABLE3>
</TABLES>
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
     <xsl:output method="text" version="1.0" encoding="UTF-8"
indent="yes"/>
<xsl:key name="elements" match="*[*]" use="name()"/>
<xsl:template match="/">
<xsl:for-each select="//*[generate-id(.)=generate-id(key
('elements',name())[1])]">
<xsl:for-each select="key('elements',name())">
<xsl:if test="position()=1">
<xsl:text>drop table </xsl:text>
<xsl:value-of select="name()"/>
<xsl:text>;&#xa;</xsl:text>
</xsl:if>
</xsl:for-each>
</xsl:for-each>
<xsl:text>&#xa;exit</xsl:text>
</xsl:template>
</xsl:stylesheet>
MSXML 3.0 OUTPUT:
drop table TABLES;
drop table TABLE1;
drop table TABLE2;
drop table TABLE3;
exit
ORAXSL OUTPUT:
java.lang.NullPointerException
Error occurred while processing test.xml: null
If I change the *[*] to just * then the XSLT will process.

Answer 1

This is a bug. I've filed Bug 2138361 to get this looked into by
development.
The workaround is to avoid using keys, moving the *[*] into the
outer select expression for the for-each:
<xsl:for-each select="//*[*]">
instead of:
<xsl:for-each select="//*[*][generate-id(.) =
                             generate-id(key('elements',name())
[1])]">